Tube frame fixing structure

ABSTRACT

A tube frame fixing structure comprises two cambered plates and tube frames. Each cambered plates has positioning holes without threads or a plurality of round grooves having threads on an inner wall thereof. Each tube frame has a plurality of through holes; the through holes of the tube frames, positioning holes and round grooves of the first and second cambered plate being aligned. A plurality of studs having threads are used to lock the two cambered plates and two tube frames. At first, each stud enters into one through hole of the tube frame. Then the stud enters into the round groove of one selected cambered plate of the two cambered plates to reach the positioning hole of the other cambered plate to resist against one wall of the tube frame. The stud moves forwards continuously so that the selected cambered plate will resist against the wall of the tube frame due to the interaction of the threads of the stud and round groove of the selected cambered plate. Thereby, the first and second cambered plates are positioned in the tube frames.

FIELD OF THE INVENTION

[0001] The present invention relates to tube frame fixing structures, and particularly to a tube frame fixing structure which are fixed to two cambered plates in the tube frame. Studs pass through the holes of the tube frames and cambered plates so as to fix the structure.

BACKGORUND OF THE INVENTION

[0002] Referring to FIG. 1, a prior art tube frame fixing structure is formed by an inner tube 5 and an outer tube 6 which are arranged by one inserts into another. Then a stud 7 is used to lock the two. Thereby, the appearance is not good since a staged region S is formed.

SUMMARY OF THE INVENTION

[0003] A tube frame fixing structure comprises two cambered plates and tube frames. Each cambered plate has positioning holes without threads or a plurality of round grooves having threads on an inner wall thereof. Each tube frame has a plurality of through holes. The through holes of the tube frames, positioning holes and round grooves of the first and second cambered plate are aligned. A plurality of studs having threads are used to lock the two cambered plates and two tube frames. At first, each stud enters into one through hole of the tube frame. Then, the stud enters into the round groove of one selected cambered plate of the two cambered plates to reach the positioning hole of the other cambered plate to resist against one wall of the tube frame. The stud moves forwards continuously so that the selected cambered plate will resist against the wall of the tube frame due to the interaction of the threads of the stud and round grooves of the selected cambered plate. Thereby, the first and second cambered plates are positioned in the tube frames.

[0004] The various objects and advantages of the present invention will be more readily understood from the following detailed description when read in conjunction with the appended drawing.

BRIEF DESCRIPTION OF THE DRAWINGS

[0005]FIG. 1 shows a prior art tube frame fixing structure.

[0006]FIG. 2 is an exploded perspective view of the present invention.

[0007]FIG. 3 is an assembled perspective view of the present invention.

[0008]FIG. 4 is a plane cross sectional view of the present invention.

[0009]FIG. 5 shows one embodiment of the present invention.

[0010]FIG. 6 shows the assembly of the present invention.

[0011]FIG. 7 shows another embodiment of the present invention.

BRIEF DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Referring to FIGS. 2 and 3, the structure of the present invention is clearly shown. The tube frame fixing structure of the present invention includes an upper cambered plate 2 and a lower cambered plate 2A. In the first embodiment of the present invention, the upper cambered plate 2 has positioning holes 22 and the lower cambered plate 2A has round grooves 21. The upper cambered plate 2 and the lower cambered plate 2A are fixed by a tube frame 1 and a tube frame 1A by using studs 3.

[0013] The tube frames 1 and 1A have through holes 11 for being locked by studs 3. The tube frames 1 and 1A are at two ends of the upper cambered plate 2 and lower cambered plate 2A.

[0014] The upper cambered plate 2 and lower cambered plate 2A are long strips. The positioning holes 22 of the upper cambered plate 2, the round grooves 21 of the lower cambered plate 2A and the through holes 11 of the tube frames 1 and 1A are aligned. Studs 3 are locked into the through holes 11. A lower thread portions of the studs 3 are locked into the round grooves 21 of the lower cambered plate 2A and the protrusions 31 of the studs 3 are positioned in the positioning holes 22 of the upper cambered plate 2 so as to press the upper cambered plate 2 and lower cambered plate 2A to resist against the tube frames 1 and 1A. Then, the studs 3 are positioned to the upper cambered plate 2 and lower cambered plate 2A.

[0015] The outer side of the through holes 11 have seals 4 for shielding the through holes 11 to present a beautiful outlook.

[0016] Referring to FIGS. 4 to 6, the operation of the present invention will be described herein. The stud 3 passes through the through hole 11 of the tube frame to the round groove 21 of the lower cambered plate 2A. Then the stud 3 moves upwards to touch the upper cambered plate 2 so that the upper cambered plate 2 is pressed to resist against an upper end of the tube frames 1 and 1A. Then, the stud 3 moves upwards continuously so that the threaded surface 211 will screw through the thread of the round groove 21 of the lower cambered plate 2A to press the lower cambered plate 2A to resist against a lower end of the tube frames 1 and 1A. Thus, the tube frames 1 and 1A around the outer peripheries of the two upper cambered plate 2 and lower cambered plate 2A are positioned.

[0017] Referring to FIG. 7, another embodiment of the present invention is illustrated. Each of the upper cambered plate 2 and lower cambered plate 2A are arranged with plurality of round grooves 21 and a plurality of positioning holes 22. The round grooves 21 and positioning holes 22 are arranged alternatively. Studs 3 pass through the round grooves 21 from the upper cambered plate 2 of the lower cambered plate 2A so as to press the upper cambered plate 2 and lower cambered plate 2A to resists against the tube frames 1 and 1A. Thereby, the upper cambered plate 2 and lower cambered plate 2A are positioned.

[0018] The present invention is thus described, it will be obvious that the same may be varied in many ways. Such variations are not to be regarded as a departure from the spirit and scope of the present invention, and all such modifications as would be obvious to one skilled in the art are intended to be included within the scope of the following claims. 

What is claimed is:
 1. A tube frame fixing structure comprising: a first cambered plate being a long cambered strip and being formed with positioning holes without threads; a second cambered plate being a long cambered strips and being formed with round grooves; the round groove having threads on an inner wall thereof; two tube frames, each tube frame having a plurality of through holes; the through holes of the tube frames, positioning holes of the first cambered plate and round grooves of the second cambered plate being aligned; wherein a plurality of studs having threads are used to lock the first and second cambered plates and two tube frames; at first, each stud enters into one through hole of the tube frame; then the stud enters into the round groove of the first cambered plate to reach the positioning hole of the second cambered plate so that the first cambered plate will resist against one wall of the tube frame; the stud moves forwards continuously so that the second cambered plate will resist against the wall of the tube frame due to the interaction of the threads of the stud and the round groove of the second cambered plate; thereby, the first and second cambered plates are positioned in the tube frames.
 2. The tube frame fixing structure as claimed in claim 1, wherein the through holes are sealed by seals to present a beautiful outlook.
 3. A tube frame fixing structure comprising: a first cambered plate being a long cambered strip; a second cambered plate being a long cambered strips and being formed with round grooves; the round groove having threads on an inner wall thereof; two tube frames, each tube frame having a plurality of through holes; the through holes of the tube frames, and round grooves of the second cambered plate being aligned; wherein a plurality of studs having threads are used to lock the first and second cambered plates and two tube frames; at first, each stud enters into one through hole of the tube frame; then the stud enters into the round groove of the first cambered plate to reach the second cambered plate so that the second cambered plate will resist against one wall of the tube frame; the stud moves forwards continuously so that the first cambered plate will resist against the wall of the tube frame due to the action of the threads of the stud and round groove of the second cambered plate; thereby, the first and second cambered plates are positioned in the tube frames.
 4. The tube frame fixing structure as claimed in claim 3, wherein the through holes are sealed by seals to present a beautiful outlook.
 5. A tube frame fixing structure comprising: a first cambered plate being a long cambered strip and being formed with positioning holes without threads and a plurality of round grooves having threads on an inner wall thereof; wherein the positioning holes and round grooves are alternatively arranged; a second cambered plate being a long cambered strips and being formed with positioning holes without threads and a plurality of round grooves having threads on an inner wall thereof; wherein the positioning holes and round grooves are alternatively arranged; two tube frames, each tube frame having a plurality of through holes; the through holes of the tube frames, positioning holes and round grooves of the first and second cambered plate being aligned; wherein a plurality of studs having threads are used to lock the first and second cambered plates and two tube frames; at first, each stud enters into one through hole of one of the two tube frame; then the stud enters into the round groove of one selected cambered plate of the first and second cambered plate to reach the positioning hole of the other cambered plate to resist against one wall of the tube frame; the stud moves forwards continuously so that the selected cambered plate will resist against the wall of the tube frame due to the action of the threads of the stud and round groove of the selected cambered plate; thereby, the first and second cambered plates are positioned in the tube frames.
 6. The tube frame fixing structure as claimed in claim 5, wherein the through holes are sealed by seals to present a beautiful outlook. 